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ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Amounts Reclassified (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net reclassifications for the period | $ 156 | $ 200 |
Defined benefit pension items |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of net loss (included within other income, net) | 208 | 266 | $ 667
Tax expense | (52) | (66) | (166)
Net reclassifications for the period | $ 156 | $ 200 | $ 501

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